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First of all. How fast and in what amounts you want this devise to be delivered ?

At the moment iv got a ongoing project for a firm which need to be finished completely little before next winter and school is on. ------------

Next, i like you to understand that very much could be done, but it requires resources. By resources i mean most of all big amount of work time and experience. The cost of product is not too much. Component value min is 10 $ and reasonable features with some performance 50 $ for signal part.

- Same method (2 or more PWM) to achieve waveforms (anything you name or draw) Sampling and more complex algorithms are needed. I cant tell you how high the frequency could be . Atm. i can tell (more sampling (good quality, resolution) = less max frequency. -The very complex task could be to use more and more external circuitry (to combine) to achieve what you need. Good part is i believe very high frequencies . Less good part is not ultimate variation in form.

Probably little less that 10 ns wide pulse repeated in amount time, time you say. Again it is accuracy. Easy is 16 bit but iv seen (external) 24 bit PWMs (tip* 4 bit max is 16 and 5 bit max is 32 ...) so you can get the picture about accuracy. and accuracy is 1/x bits.

Q*What voltages ? It is related to switching element and capacitor element. Btw ... i believe this part you may want to be controlled also. And voltage control is expensive because of transformer. Also could be achieved by capacitors and voltage progressive doublers but it is big energy loss and low variation also it is process, little like sampling. So answer is better transformer = higher energy efficient voltage and switching element rise time (situation between ON OFF) is in nS

There is also second need, maybe less popular,however would be nice to have dyi sinewave generator with variable frequency and low distortion. The best one could have two channels of sinewaves with phase difference regulated (like 90,180 phase shift).If you are experienced electronic designer then maybe you can also help with combining such sinewave generator with microcontroller so uc could adjust precisely sinewave output frequency by PWM output for example.What do you think ? Any advice is appreciated.